Improvement in plunger-pumps



H'. HARTLEY 81.1. B. MARSHALL. Plunger-Pump.

Patented 0c't.1'1,1a75.

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N. PEI'ERS. PHOTO-LITHOGRAPHER. wAsHmaTON. D C.

UNITED STATES PATENT OFFICE.

ROGER HARTLEY AND JOHN B. MARSHALL, 0E PITTSBRG, PA., AssIcNoRs To sARAH HARDIoK, EXEOUTRIX, AND JOHN RYER AND ABRAHAM H. vAN HoEsEN, EXEcUToRs, 0E oHAs. B. HARDIGK, DEoEAsED.

IMPROVEMENT IN PLUNGER-PQMPS.

Specification forming part of Letters Patent No. l 68,640. dated October 11, 1875; application liled July 16, 1875.

To all whom it may concern:

Be it known that We, ROGER HARTLEY and JOHN B. MARSHALL, of Pittsburg, in the county of Allegheny andState of Pennsylvania, have invented an Improvement in Plun ger- Pumps, of which the following is a specifica tion:

Pumps have been made with a plunger sliding through a central packing Within a cylinder, and the cylinder has. been divided in two parts at this place, and bolted together so as to allow for the introduction of such packing; but the entire cylinder, Water-ways, and valvechest have had to be made with specialrei'erence to this division of the cylinder, involving considerable labor and changing the general character and direction of the water-Ways.

Our invention is madelwith reference to introducing and adjusting a central packing in the cylinder of a plunger-pump Without mate rially changing either the cylinder or the Water-Ways, thereby adapting the improvement in question to cylinders that can beintroduced in place of those of ordinary construction.

In the drawing, Figure l is a longitudinal section of the pump-cylinder, and Fig. 2 is a crosssection ot' the same at the line x x.

The plunger a, pistonlrod c, cylinder-headv d, Water-Ways e f, induction-port g, and cyl'- inder h are the same as have before been made use of, except that lthe cylinder h is made ot' larger internal diameter at one end than the other, sufciently so to allow for the introduction of the packing-rin gs t' around the plunger in the portion of the cylinder that is otl largest diameter, such rings resting against the shoulder3 on one side, and being set up by the cylindrical sleeve Z upon the other. The internal diameters of this cylinder h and cylindrical sleeve Z are such that the plunger a, as it slides, does not touch; hence, the interior surfaces do not require to be turned orbored. rlhe plunger, however, is nished upon its exterior surface, and the packing-rings i set tightly upon it; and We remark that all these packing-rings may be elastic, or one or more may be of metal, so as to support the weight ofthe plunger; or there may be a rib cast upon the inside of the cylinder to form a support for the plunger.

In order to compress the elastic packings, and set them up from time to time, We make use ot' the screws s that pass through the head r and act upon the rear end of the sleeve l, and it is pret'erable'to provide lugs t upon the outer surface of the sleeve in line with the screws, so as to furnish the proper bearingsurt'aces for such screws, and the cylinder has grooves cast in its interior surface for the reception of these lugs.

By removing the back-head r of the cylinder the sleeve l can be withdrawn and the packing-rings replaced without disturbing 

